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#include <time.h>
extern const short __spm [];
time_t mktime ( register struct tm* const t )
{
register time_t day;
register time_t i;
if ( t->tm_year < 70 )
return (time_t) -1;
day = t->tm_yday = __spm [t->tm_mon] + t->tm_mday-1 + ( __isleap (t->tm_year+1900) & (t->tm_mon > 1) );
for ( i = 70; i < t->tm_year; i++ )
day += 365 + __isleap (i+1900);
/* day is now the number of days since 'Jan 1 1970' */
i = 7;
t->tm_wday = (day + 4) % i; /* Sunday=0, Monday=1, ..., Saturday=6 */
i = 24;
day *= i;
i = 60;
return ((day + t->tm_hour) * i + t->tm_min) * i + t->tm_sec;
}
#if 0
#include <math.h>
main()
{
int i, j, k;
static char *s[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
for (i=70; i<200; i++)
for (j=0; j<12; j++)
for (k=1; k<=31; k++) {
struct tm t;
double x;
t.tm_year = i;
t.tm_mon = j;
t.tm_mday = k;
t.tm_hour = 0;
t.tm_min = 0;
t.tm_sec = 0;
x = mktime (&t);
printf ("%4d.%5.0f %2u.%02u.%04u %s\n", (int)floor(x/86400), x-86400.*(int)floor(x/86400), k, j+1, 1900+i, s[t.tm_wday] );
}
}
#endif
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